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Grade 10IIT JEE Entrance Exam

There is a convex lens whose focal length is 10 cm and the refractive index is 2. If it's one edge is silvered then find the focal length of system

Profile image of Utkarsh
7 Years agoGrade 10
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1 Answer

Profile image of Vikas TU
6 Years ago
Dear student 
Here 
1/F = 2/f + 1/fm 
fm = infinity Because it is plano convex lens 
F = 30 
f = 60 after calculation
fm = R/2 
R = 30 cm 
1/f = (mew-1)(1/R)
mew = 1.5 
Good Luck 
 

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